devel/hdf5 update from 1.6 to 1.8

Hi,
I'd like to update hdf5 from 1.6.10nb1 to 1.8.7. The new version is
available in wip/hdf5 and wip/hdf5-c++. Any objections?
If, for whatever reason, the old version needs to stay, I can move it
to devel/hdf5-v16.
Thanks,
Alex